﻿using ICSharpCode.SharpZipLib.Checksum;
using ICSharpCode.SharpZipLib.Zip;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

namespace WebApi.Common
{
    /// <summary>  
    /// 文件(夹)压缩、解压缩  
    /// </summary>  
    //public class FileCompression
    //{
    //    #region 压缩文件
    //    /// <summary>    
    //    /// 压缩文件    
    //    /// </summary>    
    //    /// <param name="fileNames">要打包的文件列表</param>    
    //    /// <param name="GzipFileName">目标文件名</param>    
    //    /// <param name="CompressionLevel">压缩品质级别（0~9）</param>    
    //    /// <param name="deleteFile">是否删除原文件</param>  
    //    public static void CompressFile(List<FileInfo> fileNames, string GzipFileName, int CompressionLevel, bool deleteFile)
    //    {
    //        ZipOutputStream s = new ZipOutputStream(File.Create(GzipFileName));
    //        try
    //        {
    //            s.SetLevel(CompressionLevel);   //0 - store only to 9 - means best compression    
    //            foreach (FileInfo file in fileNames)
    //            {
    //                FileStream fs = null;
    //                try
    //                {
    //                    fs = file.Open(FileMode.Open, FileAccess.ReadWrite);
    //                }
    //                catch
    //                { continue; }
    //                //  方法二，将文件分批读入缓冲区    
    //                byte[] data = new byte[2048];
    //                int size = 2048;
    //                ZipEntry entry = new ZipEntry(Path.GetFileName(file.Name));
    //                entry.DateTime = (file.CreationTime > file.LastWriteTime ? file.LastWriteTime : file.CreationTime);
    //                s.PutNextEntry(entry);
    //                while (true)
    //                {
    //                    size = fs.Read(data, 0, size);
    //                    if (size <= 0) break;
    //                    s.Write(data, 0, size);
    //                }
    //                fs.Close();
    //                if (deleteFile)
    //                {
    //                    file.Delete();
    //                }
    //            }
    //        }
    //        finally
    //        {
    //            s.Finish();
    //            s.Close();
    //        }
    //    }
    //    /// <summary>    
    //    /// 压缩文件夹    
    //    /// </summary>    
    //    /// <param name="dirPath">要打包的文件夹</param>    
    //    /// <param name="GzipFileName">目标文件名</param>    
    //    /// <param name="CompressionLevel">压缩品质级别（0~9）</param>    
    //    /// <param name="deleteDir">是否删除原文件夹</param>  
    //    public static void CompressDirectory(string dirPath, string GzipFileName, int CompressionLevel, bool deleteDir)
    //    {
    //        //压缩文件为空时默认与压缩文件夹同一级目录    
    //        if (GzipFileName == string.Empty)
    //        {
    //            GzipFileName = dirPath.Substring(dirPath.LastIndexOf("//") + 1);
    //            GzipFileName = dirPath.Substring(0, dirPath.LastIndexOf("//")) + "//" + GzipFileName + ".zip";
    //        }

    //        //if (Path.GetExtension(GzipFileName) != ".zip")  
    //        //{  
    //        //    GzipFileName = GzipFileName + ".zip";  
    //        //}  
    //        using (ZipOutputStream zipoutputstream = new ZipOutputStream(File.Create(GzipFileName)))
    //        {
    //            zipoutputstream.SetLevel(CompressionLevel);
    //            Crc32 crc = new Crc32();
    //            Dictionary<string, DateTime> fileList = GetAllFies(dirPath);
    //            foreach (KeyValuePair<string, DateTime> item in fileList)
    //            {
    //                FileStream fs = File.OpenRead(item.Key.ToString());
    //                byte[] buffer = new byte[fs.Length];
    //                fs.Read(buffer, 0, buffer.Length);
    //                ZipEntry entry = new ZipEntry(item.Key.Substring(dirPath.Length));
    //                entry.DateTime = item.Value;
    //                entry.Size = fs.Length;
    //                fs.Close();
    //                crc.Reset();
    //                crc.Update(buffer);
    //                entry.Crc = crc.Value;
    //                zipoutputstream.PutNextEntry(entry);
    //                zipoutputstream.Write(buffer, 0, buffer.Length);
    //            }
    //        }
    //        if (deleteDir)
    //        {
    //            Directory.Delete(dirPath, true);
    //        }
    //    }

    //    /// <summary>    
    //    /// 压缩文件夹    
    //    /// </summary>    
    //    /// <param name="dirPath">要打包的文件夹</param>    
    //    /// <param name="GzipFileName">目标文件名</param>    
    //    /// <param name="CompressionLevel">压缩品质级别（0~9）</param>    
    //    /// <param name="deleteDir">是否删除原文件夹</param>  
    //    public static void CompressDirectory(string dirPath, string GzipFileName, int CompressionLevel, bool deleteDir, out int fileNum)
    //    {
    //        //压缩文件为空时默认与压缩文件夹同一级目录    
    //        if (GzipFileName == string.Empty)
    //        {
    //            GzipFileName = dirPath.Substring(dirPath.LastIndexOf("//") + 1);
    //            GzipFileName = dirPath.Substring(0, dirPath.LastIndexOf("//")) + "//" + GzipFileName + ".zip";
    //        }

    //        //if (Path.GetExtension(GzipFileName) != ".zip")  
    //        //{  
    //        //    GzipFileName = GzipFileName + ".zip";  
    //        //}  
    //        using (ZipOutputStream zipoutputstream = new ZipOutputStream(File.Create(GzipFileName)))
    //        {
    //            zipoutputstream.SetLevel(CompressionLevel);
    //            Crc32 crc = new Crc32();
    //            Dictionary<string, DateTime> fileList = GetAllFies(dirPath);
    //            fileNum = fileList.Count;
    //            foreach (KeyValuePair<string, DateTime> item in fileList)
    //            {
    //                FileStream fs = File.OpenRead(item.Key.ToString());
    //                byte[] buffer = new byte[fs.Length];
    //                fs.Read(buffer, 0, buffer.Length);
    //                ZipEntry entry = new ZipEntry(item.Key.Substring(dirPath.Length));
    //                entry.DateTime = item.Value;
    //                entry.Size = fs.Length;
    //                fs.Close();
    //                crc.Reset();
    //                crc.Update(buffer);
    //                entry.Crc = crc.Value;
    //                zipoutputstream.PutNextEntry(entry);
    //                zipoutputstream.Write(buffer, 0, buffer.Length);
    //            }
    //        }
    //        if (deleteDir)
    //        {
    //            Directory.Delete(dirPath, true);
    //        }
    //    }
    //    /// <summary>    
    //    /// 获取所有文件    
    //    /// </summary>    
    //    /// <returns></returns>    
    //    private static Dictionary<string, DateTime> GetAllFies(string dir)
    //    {
    //        Dictionary<string, DateTime> FilesList = new Dictionary<string, DateTime>();
    //        DirectoryInfo fileDire = new DirectoryInfo(dir);
    //        if (!fileDire.Exists)
    //        {
    //            throw new System.IO.FileNotFoundException("目录:" + fileDire.FullName + "没有找到!");
    //        }
    //        GetAllDirFiles(fileDire, FilesList);
    //        GetAllDirsFiles(fileDire.GetDirectories(), FilesList);
    //        return FilesList;
    //    }
    //    /// <summary>    
    //    /// 获取一个文件夹下的所有文件夹里的文件    
    //    /// </summary>    
    //    /// <param name="dirs"></param>    
    //    /// <param name="filesList"></param>    
    //    private static void GetAllDirsFiles(DirectoryInfo[] dirs, Dictionary<string, DateTime> filesList)
    //    {
    //        foreach (DirectoryInfo dir in dirs)
    //        {
    //            foreach (FileInfo file in dir.GetFiles("*.*"))
    //            {
    //                filesList.Add(file.FullName, file.LastWriteTime);
    //            }
    //            GetAllDirsFiles(dir.GetDirectories(), filesList);
    //        }
    //    }
    //    /// <summary>    
    //    /// 获取一个文件夹下的文件    
    //    /// </summary>    
    //    /// <param name="dir">目录名称</param>    
    //    /// <param name="filesList">文件列表HastTable</param>    
    //    private static void GetAllDirFiles(DirectoryInfo dir, Dictionary<string, DateTime> filesList)
    //    {
    //        foreach (FileInfo file in dir.GetFiles("*.*"))
    //        {
    //            filesList.Add(file.FullName, file.LastWriteTime);
    //        }
    //    }
    //    #endregion
    //    #region 解压缩文件
    //    /// <summary>    
    //    /// 解压缩文件    
    //    /// </summary>    
    //    /// <param name="GzipFile">压缩包文件名</param>    
    //    /// <param name="targetPath">解压缩目标路径</param>           
    //    public static void Decompress(string GzipFile, string targetPath)
    //    {
    //        //string directoryName = Path.GetDirectoryName(targetPath + "//") + "//";    
    //        string directoryName = targetPath;
    //        if (!Directory.Exists(directoryName)) Directory.CreateDirectory(directoryName);//生成解压目录    
    //        string CurrentDirectory = directoryName;
    //        byte[] data = new byte[2048];
    //        int size = 2048;
    //        ZipEntry theEntry = null;
    //        using (ZipInputStream s = new ZipInputStream(File.OpenRead(GzipFile)))
    //        {
    //            while ((theEntry = s.GetNextEntry()) != null)
    //            {
    //                if (theEntry.IsDirectory)
    //                {// 该结点是目录    
    //                    if (!Directory.Exists(CurrentDirectory + theEntry.Name)) Directory.CreateDirectory(CurrentDirectory + theEntry.Name);
    //                }
    //                else
    //                {
    //                    if (theEntry.Name != String.Empty)
    //                    {
    //                        //  检查多级目录是否存在  
    //                        if (theEntry.Name.Contains("//"))
    //                        {
    //                            string parentDirPath = theEntry.Name.Remove(theEntry.Name.LastIndexOf("//") + 1);
    //                            if (!Directory.Exists(parentDirPath))
    //                            {
    //                                Directory.CreateDirectory(CurrentDirectory + parentDirPath);
    //                            }
    //                        }

    //                        //解压文件到指定的目录    
    //                        using (FileStream streamWriter = File.Create(CurrentDirectory + theEntry.Name))
    //                        {
    //                            while (true)
    //                            {
    //                                size = s.Read(data, 0, data.Length);
    //                                if (size <= 0) break;
    //                                streamWriter.Write(data, 0, size);
    //                            }
    //                            streamWriter.Close();
    //                        }
    //                    }
    //                }
    //            }
    //            s.Close();
    //        }
    //    }
    //    #endregion
    //}
}
